Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8f2ddd263647
Author: Casey Yee <cyee@mozilla.com>
Desc: Merge pull request #14294 from caseyyee/bug-925933

Bug 925933 - [Building Blocks] Update toggle switch BB visual design

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https://hg.mozilla.org/integration/gaia-central/rev/e1c5e446f3ae
Author: Casey Yee <casey@caseyyee.com>
Desc: Bug 925933 - [Building Blocks] Update toggle switch BB visual design